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#!/usr/bin/env python2
#
# SPDX-License-Identifier: BSD-3-Clause
"""
This utility computes and fills Exynos ROM checksum (for BL1 or BL2).
(Algorithm from U-Boot: tools/mkexynosspl.c)
Input: IN OUT
Output:
Checksum header added to IN and written to OUT.
Header: uint32_t size, checksum, reserved[2].
"""
import struct
import sys
def main(argv):
if len(argv) != 3:
exit('usage: %s IN OUT' % argv[0])
in_name, out_name = argv[1:3]
header_format = "<IIII"
with open(in_name, "rb") as in_file, open(out_name, "wb") as out_file:
data = in_file.read()
header = struct.pack(header_format,
struct.calcsize(header_format) + len(data),
sum(map(ord, data)),
0, 0)
out_file.write(header + data)
if __name__ == '__main__':
main(sys.argv)
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